Tday

Hi ive recently brought a equinox800 and upon detecting in the grounds of an old house that has been built on an old mot and bailey. The hose I’m told is at least 1300 ive hit a signal of 15-19 on the screen, approximately 15ft from where the existing brook used to flow. (It still flows it just moved over the years) ive dug down to at least 18 inches into the river bed (the pebbles make this apparent) and the signal has grown to 32+ but I’m yet to find the source! the signal is strong but I’m doubtful the detector is reading true?! the deeper I go the stronger the reading, I’ve detected the soil I’ve recovered nothing! move filled the hole in and shall return with maybe a better tool? any ideas or experiences?